溴化铜改性硅藻土脱汞性能的实验研究  

Experimental Study on Mercury Removal Performance of Diatomite Modified With Cupric Bromide

作　　者：刘欢[1] 赵永椿[1] 张军营[1] 郑楚光[1] LIU Huan;ZHAO Yong-Chun;ZHANG Jun-Ying;ZHENG Chu-Guang(State key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science&Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学能源与动力工程学院煤燃烧国家重点实验室

出　　处：《工程热物理学报》2020年第1期246-252,共7页Journal of Engineering Thermophysics

基　　金：国家重点基础研究项目(No.2014CB238904);国家自然科学基金项目(No.51376074)

摘　　要：采用溴化铜(CuBr2)对三种硅藻土(Dia)进行改性得到脱汞吸附剂(CuBr2-Dia1、CuBr2-Dia2、CuBr2-Dia3),在固定床实验装置上研究了所制备的吸附剂的脱汞性能,并研究了不同温度和烟气组分对CuBr2-Dia3脱汞效率的影响.实验结果表明,改性后三种硅藻土的脱汞性能都有显著提高,以CuBr2-Dia3的脱汞效率最高.在纯氮气下CuBr2-Dia3的最佳脱汞温度为140℃.所吸附的汞至少存在两种形态,并且具有很好的热稳定性.O2和HCl共同作用可以提高CuBr2-Dia3的脱汞性能。NO也具有很强的促进作用.在纯氮气下加入0.03%NO后,CuBr2-Dia3的脱汞效率由原来的92.5%提高到96.0%。SO2具有明显的抑制作用,0.12%SO2能将其脱汞效率降低到59.7%,而加入4%O2和0.03%NO后,其脱汞效率又恢复到原来的水平。Novel mercury removal absorbents(CuBr2-Dia) were prepared by modifying diatomite with copper bromide(CuBr2),and its ability to remove elemental mercury was studied on a bench-scale fixed-bed reactor system.In addition,effects of different temperatures and flue gas components on mercury removal efficiency of CuBr2-Dia3 were also studied.Results showed that mercury removal performances of the three kinds of diatomite in pure N2 atmosphere have been significantly improved after modification and that of CuBr2-Dia3 was the highest.The best reaction temperature of CuBr2-Dia3 to remove mercury was 140℃.The absorbed mercury on the surface of CuBr2-Dia3 had at least two states and great thermal stability.The synergy of O2 and HCl had a positive effect.NO also had a strong promotion effect.When 0.03% NO was added into pure N2,the mercury removal efficiency of CuBr2-Dia3 was increased from 92.5% to 96.0%.SO2 had a significant inhibitory effect.0.12% SO2 reduced its mercury removal efficiency to 59.7%,while the addition of 4% O2 and 0.03% NO restored its mercury removal efficiency to its original level.

关 键 词：溴化铜 硅藻土 汞 吸附 烟气 

分 类 号：TK16[动力工程及工程热物理—热能工程]